R4S has the eMMC version named R4SE which is already documented in official OpenWrt wiki, it's known that currently this eMMC variant will not work (at least the eMMC won't show up) with official OpenWrt firmware, this needs to be stated (I saw posts asking for that from time to time).
Also, there is R4S Enterprise Edition which is not mentioned in our wiki, and people mixing it up with R4SE because we have the new firmware support on the extra EEPROM.
I would suggest you request a wiki account for yourself and make the needed edits. I'm sure other users would appreciate it.
Instruction told me to ask for access using IRC, which I did, but I haven't heard any reply yet.
It takes a bit for them to respond sometimes.
Unless you queried Paul directly (and keep in mind, no one can be at the helm 24/7, there's one real person behind it), you only entered a single ? into the channel, which doesn't really invite an answer.
I queried him directly (well, the single "?" was a mis-press on keyboard, I don't mean to use this way to connect to him), but when I came back the next day I saw nothing (my laptop rebooted and entering back with same username I assume that should be ok?)
You misunderstand the current documentation. There is currently no support for the R4SE. However the R4S Enterprise Edition is supported. This is different than the R4SE it is an R4S with the addition of an EEPROM containing a MAC Address.
I didn't misunderstood anything, I clearly stated that eMMC version (which is R4SE won't work), what I mean is, people are mixing up R4SE and R4S enterprise edition
I've added to the description that R4SE is not currently supported. I've also updated the Table Of Hardware for R4S and R4S EE which feeds the wiki page so that perhaps now it is more clear.